Sewer-mold.



PATBNTED MAY 5', 1903.. J. B. BLAW.

SEWER MOLD. APPLICATION 1KIIJJD J'AN. 20, 1903.

i0 MODEL.

. Ol' w.

Patented May 5, 1903.

' ALTENT Fries.

JACOB B. VBLAV, AOF ATLANTIC CITY, NEW JERSEY.

SPECIFICATION forming part of Letters Patent No. 727,272, dated May 5, 1903. Application led January 20, 1903l ,Serial No. 139.754. (No model.)

ing a sewer, the same being adapted to be easilylocated in position ad'rmly sustained,

provision being also made for conveniently L removing the mold, and other features are presented, as will behereinafter set forth,.the novel features of the invention being pointed out in the claims. p

Figure l represents a transverse vertical section of a sewer-mold embodyingmy invention. Fig. 2 represents a longitudinal vertical section of a portion thereof. Fig. 3 represents a vertical section of a detached portion on'an enlarged scale. Fig. 4 repre,-

sents a View of the interior offa portion shownV in Fig. 3. v

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, A designates a mold composed of a cylinder formed of up# per and lower segments B, which may be connected as one and form a mold on whicha sewer of cement, brick, or other masonry may be formed or built up: As means of connec tion for said segments I employ the plates C,.

which are secured'to-the end portions of o ne section and lap the end -port-ionfof the opjpo# site section, the lapping portions being pro-v vided with slots D, preferably staggered in Fig. 4, through which slots are passed the bolts E, the headsE' of which occupy lcountersunk openings E2 in the ends of the section outside of said plates and have thumbpieces E3, -which are flattened and which when the bolts are turned in one direction may be passed through said slots D, so as toprovide for the disconnection of. the plates with the lowersection, 'and when turnedin the other direction are designed to connect said plate and sections, thus locking the latter as one.

F designates shoes, which are of segmental form, which rest, respectively, upon the inner faces of the upper and lower sections of the mold, the same having connected with them the screws G, which latter are engaged with the central buckle H, it being evident 5 that by rotating said buckle in one direction the shoes may be pressed against the opposite sections, so as to firmly sustain and brace the same, while in ameasur'e expanding the 1 diameter of the existingcylinder. When said V'buckle is rotated in the opposite direction, the shoes are relievedland the sections are rpermittedtocontract or close, and thus in a ,.measure red nce the diameter of said cylinder.

VOn the inner faces of the sections are' the hooks J, to which areA applied cables, ropes, or equivalent devices K for contracting the sections in lateraldirection. A similar cable, rope, or equivalent device L may beco'n'nected with hooks'M on the plates C for drawing in said plates while disconnecting the sections.

The operation is as follows: The lowersection of the cylinder is placed in a' trench, on which is previously laid the cement' or other material for the lower portion of the sewer.

-The upper section of the cylinder is" then located on the lower section thereof, and the bolts E are applied. The shoes, screws, and buckle are now .inserted in proper position Vin the cylinder and said buckle operated'so as to tighten the shoes against the inner faces of the sections of the cylinder, the slots D permitting vthe sections to spread outwardly tojazlimited extenhwh'ile the sections are Mthen'subjected to pressure from within, due to the .action o f the` buckle`,and screws, as has `been stated, thuspresenting astrong struc- ;turefon which Cement or other material is laid to form the upper portion of the sewer, the latter thus being molded injan effective, practical,l and convenient manner. As another cylindenis placed-in Aposition against the one previously located the two cylinders are coupled by the plates N, which are riveted or otherwise firmly secured to one cylinder and enters the other cylinder, withl which it is screwed or bolted at N', as shown in Fig'. A2. After the Cement or material isset and the opposite cylinders are disconnected at the plate N the buckleH is rotated, so as to relieve the sections of the cylinder of the pressure of the shoes when the mold is reduced in diameter in the direction of its height. Then the cables or chains K L are twisted or tightened by means of a stick or other suitable device, as at L', so as to draw in the side IOO portions of the mold and reduce the diameter of the mold in the direction of its width, when the mold may be Withdrawn through the sewer,and so entirely removed therefrom. .As the work progresses the manhole P and the pipe Q for escape of sewer-gas are duly located.

While I have described the mold as composed of a cylinder, such form being preferred, any other suitable tubular shape may be employed for my purpose.

Various changes maybe made in the details of construction Without departing from the general spirit of my invention, and I do not, therefore, desire to be limited in each case to the same.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A sewer-mold consisting of semitubular sections and means for sustaining the mold from within and expanding the same contracting means.

2. A sewer-mold consisting of semitnbular sections and means for separating said sectionsin diametrical direction and means within saidsections forcontracting the same when separated.

3. A sewer-mold formed of semitubular sections, means for connecting said sections and means for expanding the diameter ot the mold from within the same and means for contracting the same.

4. A sewer-mold formed of semitubular sections and means for sustaining and distending the mold, the same consisting of a shoe adapted to engage a section from Within and means for advancing said shoe and means for contracting the sections when separated.

5. A sewer-mold formed of semitubular sections, means forsustaining and distending the mold, the same consisting of shoes adapted to engage the sections from within, screws tted to said shoes and a rotatable device engaging said screws and means extending diametrically of the sections and joining the connecting means.

G. AseWer-mold formed of semitubularsections, a plate attached to either section, said plate having a slot therein, and a bolt passing through said slot into the other section and having elongated head Within the sections.

7. A sewer-mold formed of semitubularsections, 4a slotted plate attached to either section and a bolt having a head freely mounted on the other section and having a thumbpiece of attened form which is adapted to pass through the slot of said plate, the body of said bolt occupying said slot.

8. A sewer-mold formed of semitu bular sections and means Within a section for contracting the same consisting of a cable or equivalent and a twisting device therein, said cable being attachable to said section.

9. Asewer-mold formed of semitubularsections, a plate connected with the end of one section and overlapping the other section from within and means connected with said plate for drawing the same inwardly.

JACOB B. BLAW.

Vitnesses:

WM. I. GARRIsoN, FRANCIS TAFFERTY. 

